ietd restart without restarting the hole quadstor daemon

[Thomas Müller]

sometimes our iscsi bound esxi-hosts looses the connection to the quadstor system, while fc bound esxi-host are still working.

is there a possibility only to restart the iscsi target daemon and not the hole quadstor?

syslog:

Jan 12 12:12:02 SDS-QUADstor01 kernel: [584218.559022] INFO: task ietd:4068 blocked for more than 120 seconds.
Jan 12 12:12:02 SDS-QUADstor01 kernel: [584218.559076]       Tainted: G           OE     4.19.0-17-amd64 #1 Debian 4.19.194-2
Jan 12 12:12:02 SDS-QUADstor01 kernel: [584218.559125] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jan 12 12:12:02 SDS-QUADstor01 kernel: [584218.559177] ietd            D    0  4068      1 0x00000000
Jan 12 12:12:02 SDS-QUADstor01 kernel: [584218.559181] Call Trace:
Jan 12 12:12:02 SDS-QUADstor01 kernel: [584218.559194]  __schedule+0x29f/0x840
Jan 12 12:12:02 SDS-QUADstor01 kernel: [584218.559199]  schedule+0x28/0x80
Jan 12 12:12:02 SDS-QUADstor01 kernel: [584218.559232]  cv_wait+0x98/0x120 [coredev]
Jan 12 12:12:02 SDS-QUADstor01 kernel: [584218.559240]  ? finish_wait+0x80/0x80
Jan 12 12:12:02 SDS-QUADstor01 kernel: [584218.559267]  device_free_initiator+0xeb/0x400 [coredev]
Jan 12 12:12:02 SDS-QUADstor01 kernel: [584218.559272]  ? wake_up_q+0x70/0x70
Jan 12 12:12:02 SDS-QUADstor01 kernel: [584218.559280]  ? __session_del+0x16c/0x1b0 [iscsit]
Jan 12 12:12:02 SDS-QUADstor01 kernel: [584218.559286]  ? del_session+0x41/0x70 [iscsit]
Jan 12 12:12:02 SDS-QUADstor01 kernel: [584218.559293]  ? ioctl+0x1ae/0x310 [iscsit]
Jan 12 12:12:02 SDS-QUADstor01 kernel: [584218.559299]  ? do_vfs_ioctl+0xa4/0x630
Jan 12 12:12:02 SDS-QUADstor01 kernel: [584218.559302]  ? ksys_ioctl+0x60/0x90
Jan 12 12:12:02 SDS-QUADstor01 kernel: [584218.559305]  ? __x64_sys_ioctl+0x16/0x20
Jan 12 12:12:02 SDS-QUADstor01 kernel: [584218.559311]  ? do_syscall_64+0x53/0x110
Jan 12 12:12:02 SDS-QUADstor01 kernel: [584218.559316]  ? entry_SYSCALL_64_after_hwframe+0x44/0xa9

[QUADStor Support]

While its not possible to restart only iscsi, we will look into the problem based on the trace and will try to fix this.

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